Self-adaptive mobile equipment quick charging protection method and system

Abstract

The invention discloses a self-adaptive quick charging protection method and system for mobile equipment, which are used for adaptively adjusting charging current and a charging stage so as to prolong the service life of a battery. The method comprises the following steps: acquiring electrochemical impedance spectroscopy data of the battery, wherein the electrochemical impedance spectroscopy data is used for being combined with the cycle index and the capacity attenuation factor of the battery to evaluate the aging degree of the battery; determining a charging current in a pre-charging stage according to an aging degree evaluation result of the battery; when the real-time voltage of the battery reaches a constant-current charging voltage threshold value, the charging current is adjusted according to the real-time temperature of the battery so as to be switched to a constant-current charging stage; when the real-time voltage of the battery reaches a constant-voltage charging voltage threshold value, the charging current is secondarily adjusted through current pulse optimization so as to be switched to a constant-voltage charging stage, and the constant-voltage charging voltage threshold value is larger than a constant-current charging voltage threshold value; and when the battery capacity of the battery reaches a preset full-load threshold value, adjusting the charging current to be within a trickle charging current range so as to switch to a trickle charging stage.

Description

Technical Field

[0001] This application relates to the field of fast charging technology, and in particular, to an adaptive fast charging protection method and system for mobile devices. Background Art

[0002] With the development of information digitization, mobile devices such as smart phones, tablets, and smart watches have been deeply integrated into people's daily life and work scenarios. Users' dependence on mobile devices is increasing day by day, which makes the battery life and charging speed of the devices become key factors affecting the user experience. To meet the urgent need for fast charging of users, various mobile devices in the market widely adopt fast charging technology. Fast charging technology can supplement a large amount of electricity to the battery in a short time by increasing the charging power, greatly shortening the charging time and significantly improving the convenience of users using the device. However, while fast charging technology brings convenience, it also causes a series of battery-related problems. During fast charging, complex electrochemical reactions occur inside the battery, generating a large amount of heat. Excessive temperature will accelerate the aging and decomposition of the internal materials of the battery, affecting the performance and life of the battery. At the same time, high-current charging will exacerbate the polarization phenomenon of the battery, leading to accelerated loss of active substances inside the battery, and thus causing the battery capacity to decay faster.

[0003] Currently, during the fast charging process of mobile devices, the charging process is usually adjusted based on basic parameters such as the voltage and current of the battery. However, when the internal state of the battery changes, the existing charging process cannot adapt to this change, which will exacerbate the decay of the battery capacity and thus limit the service life of the battery of mobile devices. Summary of the Invention

[0004] This application provides an adaptive fast charging protection method and system for mobile devices, which can adaptively adjust the charging current and charging stage to extend the service life of the battery.

[0005] In the first aspect of this application, an adaptive fast charging protection method for mobile devices is provided, including: Obtaining electrochemical impedance spectroscopy data of the battery, where the electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity decay factor of the battery; Determining the charging current in the pre-charging stage according to the evaluation result of the aging degree of the battery, and pre-charging the battery based on the charging current; When the real-time voltage of the battery reaches the constant current charging voltage threshold, adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; When the real-time voltage of the battery reaches the constant-voltage charging voltage threshold, the charging current is secondarily adjusted through current pulses to optimize and switch to the constant-voltage charging stage, and the constant-voltage charging voltage threshold is greater than the constant-current charging voltage threshold; When the battery capacity of the battery reaches the preset full-load threshold, the charging current is adjusted to be within the trickle charging current range to switch to the trickle charging stage.

[0006] Optionally, after adjusting the charging current to be within the trickle charging current range to switch to the trickle charging stage, the method further includes: Judging whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current and real-time temperature of the battery; If so, trigger a charging protection action, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

[0007] Optionally, determining the charging current in the pre-charging stage according to the evaluation result of the battery aging degree includes: Obtain the battery attributes of the battery, where the battery attributes include battery type and battery capacity range; Obtain an initial current that matches the battery attributes and the evaluation result of the aging degree from a preset charging ratio database; Correct the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

[0008] Optionally, adjusting the charging current according to the real-time temperature of the battery to switch to the constant-current charging stage includes: Calculate the current temperature deviation between the real-time temperature of the battery and the target temperature; Perform a PID operation on the current temperature deviation to obtain a current adjustment value; Sum the current adjustment value and the charging current to obtain a constant-current charging current; Charge the battery based on the constant-current charging current to switch the current charging state of the battery to the constant-current charging stage.

[0009] Optionally, secondarily adjusting the charging current through current pulses to optimize and switch to the constant-voltage charging stage includes: Apply a pulsed current to the battery; Real-time adjust the pulse parameters of the pulsed current according to the state of charge and real-time temperature of the battery, where the pulse parameters include frequency, duty cycle and amplitude; Reduce the charging current based on the real-time change of the pulse parameters to switch the current charging state of the battery to the constant-voltage charging stage.

[0010] Optionally, before optimizing the secondary adjustment of the charging current by a current pulse to switch to the constant voltage charging stage, the method further includes: Calculating a curve deviation value between the current charging curve and a preset charging curve by using a dynamic time warping algorithm; Determining a current internal state degree of the battery according to the electrochemical impedance spectroscopy data; Assigning different weights to the curve deviation value and the current internal state degree respectively, and calculating a comprehensive score; When the comprehensive score reaches a preset score value, performing the step of optimizing the secondary adjustment of the charging current by a current pulse to switch to the constant voltage charging stage.

[0011] A second aspect of the present application provides an adaptive fast charging protection system for a mobile device, including: An acquisition unit, configured to acquire electrochemical impedance spectroscopy data of a battery, and the electrochemical impedance spectroscopy data is used to evaluate an aging degree of the battery in combination with a cycle number and a capacity attenuation factor of the battery; A first determination unit, configured to determine a charging current in a pre-charging stage according to an evaluation result of the aging degree of the battery, and pre-charge the battery based on the charging current; A first adjustment unit, configured to adjust the charging current according to a real-time temperature of the battery to switch to a constant current charging stage when a real-time voltage of the battery reaches a constant current charging voltage threshold; A second adjustment unit, configured to optimize the secondary adjustment of the charging current by a current pulse to switch to a constant voltage charging stage when a real-time voltage of the battery reaches a constant voltage charging voltage threshold, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; A third adjustment unit, configured to adjust the charging current to a trickle charging current range to switch to a trickle charging stage when a battery capacity of the battery reaches a preset full load threshold.

[0012] Optionally, the system further includes: A judgment unit, configured to judge whether the battery is in an overcurrent state or an overvoltage state according to a real-time voltage, a real-time current and a real-time temperature of the battery; A trigger unit, configured to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state, and the charging protection action is used to cut off a charging process of the battery or reduce the charging current.

[0013] Optionally, the first determination unit is specifically configured to: Acquire battery attributes of the battery, where the battery attributes include a battery type and a battery capacity range; Obtain an initial current that matches the battery attributes and the aging degree evaluation result from a preset charging ratio database; Correct the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

[0014] Optionally, the first adjustment unit is specifically configured to: Calculate the current temperature deviation between the real-time temperature of the battery and the target temperature; Perform a PID operation on the current temperature deviation to obtain a current adjustment value; Sum the current adjustment value and the charging current to obtain a constant current charging current; Charge the battery based on the constant current charging current to switch the current charging state of the battery to the constant current charging stage.

[0015] It can be seen from the above technical solutions that the present application has the following effects: First, obtain the electrochemical impedance spectrum data of the battery, which is used to evaluate the aging degree of the battery in combination with the number of battery cycles and the capacity attenuation factor; then determine the charging current in the pre-charging stage according to the aging degree evaluation result of the battery, and pre-charge the battery based on the charging current; when the real-time voltage of the battery reaches the constant current charging voltage threshold, adjust the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, further optimize the secondary adjustment of the charging current through current pulses to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; when the battery capacity reaches the preset full load threshold, further adjust the charging current to the trickle charging current range to switch to the trickle charging stage. In this way, the aging degree of the battery can be accurately evaluated by combining the electrochemical impedance spectrum data, the number of battery cycles and the capacity attenuation factor of the battery, providing a reliable basis for subsequent charging strategy adjustment. According to factors such as the aging degree, real-time voltage and real-time temperature of the battery, adaptively adjust the charging current and charging stage, effectively protecting the battery while achieving fast charging and prolonging the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an embodiment of an adaptive fast charging protection method for a mobile device in the present application; Figure 2-1 and Figure 2-2 It is a schematic diagram of another embodiment of an adaptive fast charging protection method for a mobile device in the present application; Figure 3 It is a schematic diagram of an embodiment of an adaptive fast charging protection system for a mobile device in the present application; Figure 4 Another schematic diagram of an adaptive fast charging protection system for mobile devices in this application. Detailed implementation manners

[0017] This application provides an adaptive fast charging protection method and system for mobile devices, which are used to adaptively adjust the charging current and charging stage to extend the service life of the battery.

[0018] The adaptive fast charging protection method described in this application is implemented on a terminal, system or server.

[0019] Please refer to Figure 1 As shown, an embodiment of the adaptive fast charging protection method for mobile devices in this application includes: 101. Obtain the electrochemical impedance spectroscopy data of the battery, which is used to combine with the cycle number and capacity attenuation factor of the battery to evaluate the aging degree of the battery; In this embodiment, a high-precision electrochemical impedance spectroscopy measurement device is used to apply small-amplitude AC excitation signals with different frequencies to the battery of the mobile device when the mobile device is in a sleep state or a low-load state. By measuring the response of the battery to these excitation signals, the electrochemical impedance spectroscopy data of the battery is obtained. It should be noted that the electrochemical impedance spectroscopy data contains key information such as internal charge transfer resistance, diffusion impedance, and double-layer capacitance. At the same time, the cycle number data of the battery is extracted from the system log of the mobile device. The cycle number represents the complete cycle number of the battery from a fully charged state to a fully discharged state and then to a fully charged state. The capacity attenuation factor is obtained by comparing the current actual capacity of the battery with the initial rated capacity. The actual capacity can be measured by the ampere-hour integration method combined with Coulomb efficiency correction, and the initial rated capacity represents the rated capacity of the battery when it is first used. After obtaining the electrochemical impedance spectroscopy data, cycle number and capacity attenuation factor of the battery, a pre-established neural network model or equivalent circuit model can be used to evaluate the aging degree. For example: a large number of battery sample data with different aging degrees are used in advance to train a battery aging evaluation model through a support vector machine algorithm. The obtained electrochemical impedance spectroscopy data, battery cycle number and capacity attenuation factor are input into the battery aging evaluation model, and the model outputs the aging degree evaluation result of the battery. The aging degree evaluation result can be presented in the form of a percentage. For example, if the aging degree evaluation result is 60%, it represents that the aging degree of the battery is at a medium level.

[0020] 102. Determine the charging current in the pre-charging stage according to the aging degree evaluation result of the battery, and pre-charge the battery based on the charging current; In this embodiment, the main purpose of the pre-charging stage is to recover and activate an over-discharged or aged battery, and the charging current is relatively small during this stage. After obtaining the evaluation result of the battery aging degree, the current matching the evaluation result of the aging degree is queried from the preset charging ratio database to determine the charging current in the pre-charging stage. For example: The following rules can be preset in the preset charging ratio database: slightly aged corresponds to 0.6C, less aged corresponds to 0.5C, moderately aged corresponds to 0.4C, more highly aged corresponds to 0.3C, severely aged corresponds to 0.2C, where C is the rated capacity of the battery. 0-20% in the evaluation result of the aging degree represents slightly aged, 21-40% represents less aged, 41-60% represents moderately aged, 61-80% represents more highly aged, and 81-100% represents severely aged.

[0021] 103. When the real-time voltage of the battery reaches the constant-current charging voltage threshold, adjust the charging current according to the real-time temperature of the battery to switch to the constant-current charging stage; During the pre-charging process, continuously monitor the real-time voltage of the battery, and collect the real-time temperature of the battery through a temperature sensor installed on the battery pack housing. When the real-time voltage of the battery rises to the preset constant-current charging voltage threshold, adjust the current charging current through the temperature feedback of the real-time temperature. At this time, the charging current will quickly increase from the small value in the pre-charging stage to the set value in the constant-current charging stage to switch the charging state of the battery from the pre-charging stage to the constant-current charging stage. It should be noted that during the pre-charging stage, the active substances on the electrode surface in the battery are mainly activated and repaired, and lithium ions begin to migrate from the positive electrode to the negative electrode, but the migration speed is slow. After entering the constant-current charging stage, the migration speed of lithium ions increases, and the chemical reaction inside the battery becomes more intense. A large number of lithium ions in the positive electrode material are deintercalated, diffuse to the negative electrode through the electrolyte, and are embedded in the negative electrode material. At the same time, the internal resistance of the battery will generate a certain amount of heat with the increase of the current. At this time, the heat dissipation system needs to dissipate the heat in time to maintain the normal temperature of the battery.

[0022] 104. When the real-time voltage of the battery reaches the constant-voltage charging voltage threshold, optimize and secondarily adjust the charging current through current pulses to switch to the constant-voltage charging stage, and the constant-voltage charging voltage threshold is greater than the constant-current charging voltage threshold; During the constant-current charging process, the real-time voltage of the battery continuously rises as charging progresses. When the real-time voltage of the battery reaches the constant-voltage charging voltage threshold, the switch from constant-current charging to constant-voltage charging is triggered. During the constant-voltage charging stage, the real-time voltage remains unchanged within the range near the constant-voltage charging voltage threshold, while the charging current gradually decreases as the battery charge increases. The decrease process of the charging current is dynamically adjusted using current pulse optimization technology to improve the stability of battery charging. It should be noted that after entering the constant-voltage charging stage, as the battery charge continues to increase, the difficulty of lithium ions embedding into the negative electrode material gradually increases. The polarization phenomenon inside the battery also gradually intensifies, resulting in an increase in the internal resistance of the battery. At this time, although the voltage remains unchanged, the decrease in the charging current means that the migration speed of lithium ions slows down, and the chemical reaction inside the battery gradually becomes gentle. At the same time, the heat generation inside the battery also decreases as the charging current decreases.

[0023] 105. When the battery capacity of the battery reaches the preset full-load threshold, the charging current is adjusted to the trickle charging current range to switch to the trickle charging stage.

[0024] During the constant-voltage charging process, the battery capacity continuously increases. When the battery capacity increases to the preset full-load threshold, according to the real-time temperature and using the temperature compensation algorithm, the charging current is reduced, and the charging current is adjusted to the trickle charging current range. For example, the trickle charging current range can be set to 1% - 5% of the battery rated capacity to switch the charging state of the battery from the constant-voltage charging stage to the trickle charging stage. During the trickle charging stage, by supplementing the battery with a tiny charging current, the battery capacity reaches the fully saturated state, while avoiding overcharging and further protecting the battery.

[0025] In this embodiment, first, the electrochemical impedance spectroscopy data of the battery is obtained. This electrochemical impedance spectroscopy data is used in combination with the number of battery cycles and the capacity attenuation factor to evaluate the aging degree of the battery. Then, based on the evaluation result of the battery aging degree, the charging current in the pre-charging stage is determined, and the battery is pre-charged based on the charging current. When the real-time voltage of the battery reaches the constant current charging voltage threshold, the charging current is adjusted according to the real-time temperature of the battery to switch to the constant current charging stage. When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, the charging current is further optimized by current pulses for secondary adjustment to switch to the constant voltage charging stage, where the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold. When the battery capacity reaches the preset full load threshold, the charging current is further adjusted to the trickle charging current range to switch to the trickle charging stage. In this way, the aging degree of the battery can be accurately evaluated by combining the electrochemical impedance spectroscopy data, the number of battery cycles, and the capacity attenuation factor, providing a reliable basis for subsequent charging strategy adjustment. According to factors such as the aging degree, real-time voltage, and real-time temperature of the battery, the charging current and charging stage are adaptively adjusted, effectively protecting the battery while achieving fast charging and extending the service life of the battery.

[0026] Please refer to Figure 2-1 and Figure 2-2 As shown, another embodiment of the adaptive fast charging protection method for mobile devices in this application includes: 201. Obtain the electrochemical impedance spectroscopy data of the battery. This electrochemical impedance spectroscopy data is used in combination with the number of battery cycles and the capacity attenuation factor to evaluate the aging degree of the battery; Step 201 in this embodiment is similar to step 101 in the Figure 1 embodiment shown above, and will not be elaborated here.

[0027] 202. Obtain the battery attributes of the battery. The battery attributes include the battery type and the battery capacity range; 203. Obtain the initial current that matches the battery attributes and the evaluation result of the aging degree from the preset charging ratio database; 204. Correct the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage, and pre-charge the battery based on the charging current; Optionally, in this embodiment, a preset charging ratio database can be established in advance. The preset charging ratio database stores the corresponding relationship between variables such as battery type, battery capacity range, and aging degree evaluation result and the initial current, where the initial current represents the safe starting current of the battery during charging. For example: The battery type of battery A is a lithium-ion battery, the battery capacity range is 1000mAh - 2000mAh, the aging degree evaluation result is mild aging, and the corresponding initial current is 0.8C, where C is the rated capacity of the battery. In addition, since different temperature environmental conditions will have different effects on the safe starting current of the battery, after obtaining the initial current, the initial current can be corrected according to the real-time temperature of the battery to improve the safety of the battery. Specifically, the initial current can be corrected by a segmented temperature compensation method. For example: When the real-time temperature of the battery is in the low temperature range of 0 - 10°C, the temperature compensation coefficient is set to 0.75, and at this time the initial current needs to be adjusted to 75% of the original; when the real-time temperature of the battery is in the high temperature range of 30 - 40°C, the temperature compensation coefficient is set to 0.85, and at this time the initial current needs to be adjusted to 85% of the original.

[0028] 205. When the real-time voltage of the battery reaches the constant current charging voltage threshold, calculate the current temperature deviation between the real-time temperature of the battery and the target temperature; 206. Perform a PID operation on the current temperature deviation to obtain a current adjustment value; 207. Sum the current adjustment value and the charging current to obtain a constant current charging current; 208. Charge the battery based on the constant current charging current to switch the current charging state of the battery to the constant current charging stage; Optionally, in this embodiment, when the real-time voltage of the battery reaches the constant current charging voltage threshold, it indicates that it can be switched to the constant current charging stage. At this time, the constant current charging current can be determined by the PID control algorithm of the real-time temperature. Specifically, set the current temperature of the battery to , the target temperature to , and the current temperature difference . During the PID operation, the proportional link outputs , where is the proportional coefficient, which determines the rapid response degree of the system to the temperature deviation; the integral link outputs , where is the integral coefficient, which is used to eliminate the steady-state error of the system; the derivative link outputs , where is the derivative coefficient, which can predict the temperature change trend and improve the stability of the system. After the PID operation, the current adjustment value is obtained. Then, the charging current in the pre-charging stage and the current adjustment value Perform addition to obtain the constant current charging current. It should be noted that during the constant current charging process, the state of charge of the battery has a significant impact on the growth rate of the current. At this time, the state of charge of the battery can be monitored in real time, and different current growth strategies can be adopted according to different state of charge intervals. For example: when the state of charge of the battery is low, in order to accelerate the charging process, the current growth rate can be appropriately increased; when the state of charge of the battery is within the normal range, the current remains constant growth to charge the battery at a stable rate; when the state of charge of the battery is high, in order to ensure the stability and safety of charging and avoid overheating of the battery due to overcharging, the growth rate of the current can be slowed down.

[0029] 209. When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, use the dynamic time warping algorithm to calculate the curve deviation value between the current charging curve and the preset charging curve; 210. Determine the current internal state degree of the battery according to the electrochemical impedance spectroscopy data; 211. Assign different weights to the curve deviation value and the current internal state degree respectively, and calculate the comprehensive score; Optionally, in this embodiment, after the real-time voltage of the battery reaches the constant voltage charging voltage threshold, it is possible to further determine whether to enter the constant voltage charging stage based on the curve deviation value between the current charging curve and the preset charging curve and the current internal state degree of the battery, so as to improve the reliability of the charging stage switching, thereby further improving the service life of the battery. Specifically, first, perform data preprocessing such as data smoothing and normalization on the voltage-time data sequence collected during the actual charging process and the preset charging curve data sequence to eliminate the influence of data noise and dimensional differences. Then, measure the similarity between the two curves by calculating the Euclidean distance between the two curves to obtain the curve deviation value. In the specific calculation process, the dynamic programming algorithm can be used to find the optimal matching path between the two curves, so that the sum of the distances corresponding to the points on the path is the smallest. If the calculated curve deviation value is large, it indicates that there is a large difference between the actual charging process and the standard charging process, and this difference may be caused by reasons such as battery individual differences, different aging degrees, and environmental factor changes. In this case, even if the real-time voltage of the battery has not reached the constant voltage charging voltage threshold, the stage conversion timing can be advanced or postponed according to the actual situation. For example, when the voltage rising speed of the current charging curve is significantly faster than the preset charging curve, it may mean that the chemical reaction activity inside the battery is high. To prevent overcharging, the constant current voltage charging stage can be switched in advance; conversely, if the voltage rises slowly, the switching can be postponed appropriately to ensure that the battery can be fully charged. Therefore, the curve deviation value between the current charging curve and the preset charging curve can be used as one of the influencing factors for the switching of the constant current voltage charging stage.

[0030] After obtaining the curve deviation value between the current charging curve and the preset charging curve, the complex nonlinear least squares method is used to fit the electrochemical impedance spectroscopy data to obtain the equivalent circuit model parameters of the battery, such as charge transfer resistance, diffusion impedance, double-layer capacitance, etc. These parameters can reflect the charge transfer process, ion diffusion process inside the battery, and the characteristics of the electrode-electrolyte interface, thereby determining the current internal state degree of the battery. When the current internal state degree of the battery reaches a specific degree, the conversion from constant current charging to constant voltage charging will be triggered. For example, as the charging progresses, the charge transfer resistance of the battery will gradually increase. When the charge transfer resistance increases to 1.5 times the initial value, it indicates that the charge transfer process inside the battery is significantly hindered and the polarization phenomenon intensifies. At this time, even if the real-time voltage does not reach the constant voltage charging voltage threshold, the conversion can be started in advance. Therefore, the current internal state degree of the battery can also be used as one of the influencing factors for the switching of the constant voltage charging stage. After obtaining the curve deviation value and the current internal state degree, different weights are assigned to the curve deviation value and the current internal state degree respectively. After summing, a comprehensive score is calculated. When the comprehensive score reaches the preset score value, it can be determined that the switching to the constant voltage charging stage can be carried out.

[0031] 212. When the comprehensive score reaches the preset score value, apply a pulsed current to the battery; 213. Adjust the pulse parameters of the pulsed current in real time according to the state of charge and real-time temperature of the battery. The pulse parameters include frequency, duty cycle, and amplitude; 214. Based on the real-time change of the pulse parameters, reduce the charging current to switch the current charging state of the battery to the constant voltage charging stage. The constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; Optionally, in this embodiment, the current pulse optimization technology can be used to control the reduction process of the charging current. The pulsed current can effectively reduce the charging current by adjusting its own parameters. The core lies in using the periodic change characteristics of the pulsed current to optimize the charging process of the battery and avoid damage to the battery caused by excessive charging current. Specifically, by applying a series of pulsed currents to the battery and changing the pulse parameters such as the frequency, duty cycle, and amplitude of the pulsed current, the charging current during the constant voltage charging process is reduced. When the state of charge of the battery is low, the frequency of the pulsed current can be increased to accelerate the charging speed; when the real-time temperature of the battery is high, the amplitude and duty cycle of the pulsed current can be reduced to reduce the battery heating. Under the action of the pulsed current, the charging current can be adjusted more accurately according to the battery state, and on the premise of ensuring that the battery can be fully charged, the service life of the battery is extended. For example, for a battery with a higher degree of aging, the frequency of the pulsed current can be reduced to avoid damage to the battery caused by high-frequency pulses. At the same time, through the adjustment of the pulsed current, the charging current decreases slowly, allowing the battery to complete the charging process smoothly.

[0032] 215. When the battery capacity of the battery reaches the preset full load threshold, adjust the charging current to within the trickle charging current range to switch to the trickle charging stage; 216. Determine whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current and real-time temperature of the battery. If so, execute step 217; 217. Trigger a charging protection action, which is used to cut off the charging process of the battery or reduce the charging current.

[0033] Optionally, in this embodiment, during all charging stages, the real-time voltage, real-time current and real-time temperature of the battery can be monitored in real time. By determining whether the real-time voltage, real-time current and real-time temperature of the battery meet the preset safety conditions, it is determined whether the battery is in an overcurrent or overvoltage state. When it is determined that the battery is in an overcurrent or overvoltage state, the charging process of the battery can be cut off or the charging current can be reduced, so that the charging current quickly drops to a safe range, preventing the battery from deteriorating in performance or causing a safety accident due to abnormal conditions.

[0034] Please refer to Figure 3 As shown, an embodiment of the adaptive fast charging protection system for mobile devices in this application includes: An acquisition unit 301, configured to acquire the electrochemical impedance spectrum data of the battery, and the electrochemical impedance spectrum data is used to combine with the number of battery cycles and the capacity attenuation factor to evaluate the aging degree of the battery; A first determination unit 302, configured to determine the charging current in the pre-charging stage according to the evaluation result of the battery aging degree, and pre-charge the battery based on the charging current; A first adjustment unit 303, configured to adjust the charging current according to the real-time temperature of the battery when the real-time voltage of the battery reaches the constant current charging voltage threshold to switch to the constant current charging stage; A second adjustment unit 304, configured to optimize the charging current by current pulse secondary adjustment to switch to the constant voltage charging stage when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; A third adjustment unit 305, configured to adjust the charging current to within the trickle charging current range to switch to the trickle charging stage when the battery capacity of the battery reaches the preset full load threshold.

[0035] In this embodiment, the acquisition unit 301 acquires the electrochemical impedance spectrum data of the battery, which is used to evaluate the aging degree of the battery in combination with the number of battery cycles and the capacity attenuation factor; the first determination unit 302 determines the charging current in the pre-charging stage according to the evaluation result of the battery aging degree, and pre-charges the battery based on the charging current; when the real-time voltage of the battery reaches the constant current charging voltage threshold, the first adjustment unit 303 adjusts the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, the second adjustment unit 304 optimizes the secondary adjustment of the charging current through current pulses to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; when the battery capacity reaches the preset full load threshold, the third adjustment unit 305 adjusts the charging current to the trickle charging current range to switch to the trickle charging stage. In this way, the aging degree of the battery can be accurately evaluated by combining the electrochemical impedance spectrum data, the number of battery cycles and the capacity attenuation factor of the battery, providing a reliable basis for the subsequent adjustment of the charging strategy. According to factors such as the aging degree, real-time voltage and real-time temperature of the battery, the charging current and charging stage are adaptively adjusted, effectively protecting the battery while achieving fast charging and extending the service life of the battery.

[0036] Please refer to Figure 4 As shown, another embodiment of the adaptive fast charging protection system for mobile devices in this application includes: An acquisition unit 401, configured to acquire the electrochemical impedance spectrum data of the battery, which is used to evaluate the aging degree of the battery in combination with the number of battery cycles and the capacity attenuation factor; A first determination unit 402, specifically configured to acquire the battery attributes of the battery, where the battery attributes include the battery type and the battery capacity range; acquire the initial current matching the battery attributes and the aging degree evaluation result from a preset charging ratio database; correct the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage; A first adjustment unit 403, configured to calculate the current temperature deviation between the real-time temperature of the battery and the target temperature when the real-time voltage of the battery reaches the constant current charging voltage threshold; perform a PID operation on the current temperature deviation to obtain a current adjustment value; sum the current adjustment value and the charging current to obtain a constant current charging current; charge the battery based on the constant current charging current to switch the current charging state of the battery to the constant current charging stage; A first calculation unit 404, configured to calculate the curve deviation value between the current charging curve and the preset charging curve using the dynamic time warping algorithm when the real-time voltage of the battery reaches the constant voltage charging voltage threshold; A second determination unit 405, configured to determine the current internal state degree of the battery according to the electrochemical impedance spectrum data; A second calculation unit 406 is configured to assign different weights to the curve deviation value and the current internal state degree respectively, and calculate a comprehensive score. A second adjustment unit 407 is specifically configured to apply a pulsed current to the battery when the comprehensive score reaches a preset score value; adjust the pulse parameters of the pulsed current in real time according to the state of charge and the real-time temperature of the battery, where the pulse parameters include frequency, duty cycle, and amplitude; reduce the charging current based on the real-time change of the pulse parameters to switch the current charging state of the battery to the constant voltage charging stage. A third adjustment unit 408 is configured to adjust the charging current to within the trickle charging current range to switch to the trickle charging stage when the battery capacity of the battery reaches a preset full load threshold. A judgment unit 409 is configured to judge whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery. A trigger unit 410 is configured to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

[0037] In this embodiment, the functions of each unit are similar to those of steps 201 to 217 in the foregoing Figure 2-1 and Figure 2-2 illustrated embodiment, and will not be elaborated herein.

[0038] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described system, device, and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0039] In several embodiments provided in the present application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection of the device or unit may be in electrical, mechanical, or other forms.

[0040] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0041] In addition, the functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0042] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, read-only memory), random access memories (RAM, random access memory), magnetic disks, or optical discs that can store program codes.

Claims

1. An adaptive fast charging protection method for mobile devices, characterized in that, Including: Obtaining the electrochemical impedance spectroscopy data of the battery, which is used to evaluate the aging degree of the battery in combination with the number of charge and discharge cycles and the capacity attenuation factor of the battery; Determining the charging current in the pre-charging stage according to the evaluation result of the aging degree of the battery, and pre-charging the battery based on the charging current; When the real-time voltage of the battery reaches the constant current charging voltage threshold, adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, optimizing and secondarily adjusting the charging current through current pulses to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; When the battery capacity of the battery reaches the preset full load threshold, adjusting the charging current to the trickle charging current range to switch to the trickle charging stage.

2. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that, After adjusting the charging current to the trickle charging current range to switch to the trickle charging stage, the method further includes: Judging whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current and real-time temperature of the battery; If so, triggering a charging protection action, which is used to cut off the charging process of the battery or reduce the charging current.

3. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that, The determining the charging current in the pre-charging stage according to the evaluation result of the aging degree of the battery includes: Obtaining the battery attributes of the battery, where the battery attributes include battery type and battery capacity range; Obtaining an initial current matching the battery attributes and the evaluation result of the aging degree from a preset charging ratio database; Correcting the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

4. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that, The adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage includes: Calculating the current temperature deviation between the real-time temperature of the battery and the target temperature; Performing a PID operation on the current temperature deviation to obtain a current adjustment value; Adding the current adjustment value and the charging current to obtain a constant current charging current; Charging the battery based on the constant current charging current to switch the current charging state of the battery to the constant current charging stage.

5. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that, The optimizing and secondarily adjusting the charging current through current pulses to switch to the constant voltage charging stage includes: Applying a pulsed current to the battery; Adjusting the pulse parameters of the pulsed current in real time according to the state of charge and real-time temperature of the battery, where the pulse parameters include frequency, duty cycle and amplitude; Reducing the charging current based on the real-time change of the pulse parameters to switch the current charging state of the battery to the constant voltage charging stage.

6. The adaptive fast charging protection method for mobile devices according to any one of claims 1 to 5, characterized in that, Before the optimizing and secondarily adjusting the charging current through current pulses to switch to the constant voltage charging stage, the method further includes: Calculating the curve deviation value between the current charging curve and the preset charging curve by using the dynamic time warping algorithm; Determining the current internal state degree of the battery according to the electrochemical impedance spectroscopy data; Assigning different weights to the curve deviation value and the current internal state degree respectively, and calculating a comprehensive score; When the comprehensive score reaches the preset score value, execute the step of optimizing the charging current by current pulse to perform secondary adjustment and switch to the constant voltage charging stage.

7. An adaptive fast charging protection system for mobile devices, characterized in that, It includes: An acquisition unit, configured to acquire the electrochemical impedance spectrum data of the battery, and the electrochemical impedance spectrum data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery; A first determination unit, configured to determine the charging current in the pre-charging stage according to the evaluation result of the aging degree of the battery, and pre-charge the battery based on the charging current; A first adjustment unit, configured to, when the real-time voltage of the battery reaches the constant current charging voltage threshold, adjust the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; A second adjustment unit, configured to, when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, optimize the charging current by current pulse for secondary adjustment and switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; A third adjustment unit, configured to, when the battery capacity of the battery reaches the preset full load threshold, adjust the charging current to within the trickle charging current range to switch to the trickle charging stage.

8. The adaptive fast charging protection system for mobile devices according to claim 7, wherein, The system further includes: A judgment unit, configured to judge whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery; A trigger unit, configured to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

9. The adaptive fast charging protection system for mobile devices according to claim 7, wherein, The first determination unit is specifically configured to: Acquire the battery attributes of the battery, where the battery attributes include the battery type and the battery capacity range; Acquire the initial current matching the battery attributes and the aging degree evaluation result from a preset charging ratio database; Correct the initial current according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

10. The adaptive fast charging protection system for mobile devices according to claim 7, wherein, The first adjustment unit is specifically configured to: Calculate the current temperature deviation between the real-time temperature of the battery and the target temperature; Perform a PID operation on the current temperature deviation to obtain a current adjustment value; Sum the current adjustment value and the charging current to obtain a constant current charging current; Charge the battery based on the constant current charging current to switch the current charging state of the battery to the constant current charging stage.

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